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Answers
Answer:
a part of a periderm that protects the inner plant tissuses from mechanical injuires water lose and pathogen and comprised of cells that are dead at maturaty and filled with air tannins resins
QUESTION (5 marks):-
- What is cork in a plant body?
- What is suberin?
- What is cutin?
- What are guard cells?
- What is the function of stomata?
QUESTION (2 marks):-
6. What is epidermics and its functions in plant body?
7. Write about sclerenchyma?
QUESTION (1 mark):-
8. What is stomata?
ANSWERS:-
- The outermost layer of tissue in woody plants that is resistant to the passage of water vapor and gases and that becomes the bark is called cork.
2. Suberin is a cell wall-associated biopolymer found in specific cell types, such as root epidermis, root endodermis (including the Casparian band), bundle sheath cells and the periderm (cork) of woody species and underground organs (e.g., tubers).
3. Cutin is one of two waxy polymers that are the main components of the plant cuticle, which covers all aerial surfaces of plants. The other major cuticle polymer is cutan, which is much more readily preserved in the fossil record.
4. Guard cells are another type of plant single-cell models to study early signal transduction and stress tolerance mechanisms in plants. Guard cells are surrounded by stomatal pores and are located in leaf epidermis. Guard cells control influx and efflux of CO2 and water from leaves, respectively
5. Functions of the stomata:
- They allow the exchange of gases (CO2 and O2) with the atmosphere.
- Evaporation of water from the leaf surface occurs through the stomata.
Thus, the stomata help in the process of transpiration. Based on the climatic conditions, it closes or opens its pores to maintain the moisture balance.
6. The epidermis is the outer layer of cells of all aboveground (i.e., aerial) organs that are in the primary stage of growth.
The two primary functions of the epidermis on the leaf, flower, and stem are to limit water loss and to control gas exchange.
7. Sclerenchyma cells are elongated, dead cells with lignin deposits in their cell wall. They have no intercellular gaps. Sclerenchyma is found in the covering of seeds and nuts, around the vascular tissues in stems and the veins of leaves. Sclerenchyma provides strength to the plant.
8. Stomata are the tiny pores on the leaves through which plants absorb atmospheric carbon dioxide. They are normally found on the underside of the leaves.
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